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Plumeless
Thistle - Carduus acanthoides
Family: Asteraceae
THIS PAGE IS UNDER CONSTRUCTION.
Description
Plumeless thistle is a winter annual or biennial herb 3-10 dm tall with a stout fleshy taproot. The stems are freely branching with spiny wings extending to the flowering heads. The leaves are alternate, deeply lobed or pinnatifid with spiny margins. They are sessile, decurrent, elliptic to lanceolate or oblong in shape. The blade surface may be glabrous or pubescent. The flowers are purple in discoid heads surrounded by involucral bracts < 2 mm wide. The heads are erect, single or clustered at the ends of the branches. The pappus is composed of numerous capillary bristles 1-1.2 cm long.
Interesting facts
The plant rarely flowers the first year. The second year, flowering occurs from May - August. It is infrequent to locally abundant in pastures, stream valleys, fields, roadsides, and waste places.
The spiny plant invades fields and pastures competing with native species or forage crops.
Links to more information
Website, video, and graphics by Rob Nelson
For more information on this plant or management please contact US Army Corp of Engineers
